A suspicious package left in the middle of the roadway early Wednesday shut down San Francisco streets for nearly two hours as authorities investigated the scene.

Officers received a call about 8:15 a.m. about an “unattended package” on Cabrillo Street, between Fifth and Sixth avenues, said Officer Robert Rueca, a spokesman with the San Francisco Police Department.

“It appears suspicious,” Rueca said, declining to elaborate why.

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Media: Katie Wood / SFGATE

Traffic was reopened by 10:25 a.m.

A separate incident involving an explosive device Tuesday afternoon resulted in the arrest of a man and woman during a traffic stop, authorities said.

The incident occurred just after 2 p.m. near the intersection of 19th Avenue and Sloat Boulevard, police said.

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Officers stopped a vehicle and discovered the driver, a 30-year-old man, was on probation, police said.

When officers searched the vehicle, they found a suspected explosive device.

“It’s something that could go boom,” Rueca said.

“The fact that it was homemade, that means that someone put it together so we have to treat those types of devices as if they are functioning versus just having the items in a container, but not put together,” Rueca added.

The male driver and a 27-year-old female passenger were arrested and booked at San Francisco County Jail.

Neither of the suspects were identified. Rueca declined to say why the driver was on probation.